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A kind of organic carrier-free polysiloxane particle and preparation method thereof

A technology of polysiloxane and organic carrier, applied in the field of organic carrier-free polysiloxane particles and their preparation, can solve the problems of limited use and promotion, limited application of boric acid, etc., and achieves improved processing fluidity and improved surface finish. Smooth, easy granulation effect

Active Publication Date: 2022-05-24
CHENGDU SILIKE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in June 2010, the European Chemicals Agency (ECHA) included boric acid in the REACH Substances of Very High Concern (SVHC) list, which further restricted the application of boric acid, which in turn restricted the use and promotion of this method.

Method used

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  • A kind of organic carrier-free polysiloxane particle and preparation method thereof
  • A kind of organic carrier-free polysiloxane particle and preparation method thereof
  • A kind of organic carrier-free polysiloxane particle and preparation method thereof

Examples

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preparation example Construction

[0018] The invention provides a preparation method of organic carrier-free polysiloxane particles, which comprises the following steps: S1. Reaction and mixing of polysiloxane, silica, grafting agent and catalyst A in a kneader or an internal mixer 0.5 to 3 hours, a high-viscosity polysiloxane composition is prepared; the polysiloxane contains 0.02%-0.2% of vinyl groups; S2. The high-viscosity polysiloxane composition and filler prepared in step S1 are used Melt mixing and extrusion granulation to prepare organocarrier-free polysiloxane granules.

[0019] In the present invention, by melt-mixing reaction of vinyl group-containing polysiloxane, silica, grafting agent and catalyst A, silica with a large number of hydrogen bonds on the surface and vinyl group-containing polysiloxane can generate silicon hydrogen Addition reaction, so that the silica is grafted on the surface of polysiloxane, and at the same time, the polysiloxane itself undergoes a chain extension reaction, under...

Embodiment 1

[0038] A preparation method of organic carrier-free polysiloxane particles, comprising the steps of:

[0039] S1. Set the viscosity to 5×10 6 mPa·S, 100 parts of linear polysiloxane with vinyl content of 0.12%, specific surface area of ​​180m 2 10 parts of superfine silica by precipitation method per g, 0.005 part of hydrogen-containing siloxane containing 0.35% hydrogen and 1 part of Pt-containing catalyst A with a Pt content of 500 ppm, react and mix in an internal mixer at 150° C. for 2 hours to prepare The obtained high-viscosity polysiloxane composition is denoted as A;

[0040] S2. The specific surface area of ​​the high-viscosity polysiloxane composition A prepared in step S1 and 50 parts of the surface-treated silane coupling agent is 180 m 2 / g of precipitated silica, added to the kneader and mixed at 150°C for 3 hours; then the mixed material was fed into a reciprocating single-screw extruder through a double cone and extruded at 150°C, and pelletized by air-cooled...

Embodiment 2

[0042] A preparation method of organic carrier-free polysiloxane particles, the difference from Example 1 is:

[0043] The white carbon black in step S1 is replaced with modified white carbon black A, and the preparation method of modified white carbon black A includes: the specific surface area is 180 m 2 100 parts of precipitation method ultrafine white carbon black and 3 parts of vinyltrimethoxysilane were kneaded in a kneader at 150°C.

[0044] The polysiloxane particles prepared in step S2 of this example are denoted as SK-2.

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Abstract

The invention belongs to the field of polymer materials, and provides a method for preparing polysiloxane particles without an organic carrier, comprising the following steps: S1. putting polysiloxane, white carbon black, grafting agent and catalyst A in a kneader or Reaction and mixing in an internal mixer to prepare a high-viscosity polysiloxane composition; the polysiloxane contains 0.02%-0.2% vinyl; S2. The high-viscosity polysiloxane composition prepared in step S1 The compound and the filler are mixed in a kneader or an internal mixer, extruded and granulated to prepare organic carrier-free polysiloxane granules. The method has the advantages of simple technological process, safe raw materials and easy production, excellent product performance, and good application and popularization prospects. The present invention also provides organic carrier-free polysiloxane particles prepared by the above method, which are suitable for processing almost all thermoplastic resins, can improve the processing fluidity of thermoplastic resins, and can improve the surface smoothness of products and reduce the surface Friction coefficient and improved wear resistance and scratch resistance, etc.

Description

technical field [0001] The invention belongs to the field of polymer materials, in particular to an organic carrier-free polysiloxane particle and a preparation method thereof. Background technique [0002] Silicone materials are a kind of special polymer materials with semi-organic and semi-inorganic structures, which have unique and excellent properties. Silicone lubricant is a plastic lubricant, including silicone masterbatch and silicone powder, which has a wide range of applications in plastic modification, pipes, films, automotive interiors, wires and cables, etc. [0003] The MB50 lubricant series products first launched by Dow Corning Company in the United States are silicone masterbatches with ultra-high molecular weight silicone as the lubricating active ingredient and different resins as the carrier. The dosage in the plastic processing process is generally about 0.2% to 5%. . The emergence of silicone masterbatch overcomes the shortcomings of traditional silico...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L87/00C08K9/06C08K7/26C08K9/04C08K3/34C08G83/00
CPCC08K9/06C08K7/26C08K9/04C08K3/34C08G83/001C08K2201/006C08L87/005
Inventor 徐龙平何雅僖雷霆王伟杰
Owner CHENGDU SILIKE TECH
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